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外语
Most environmental problems exist because adequate measures for preventing them _________ taken in the past.
Most environmental problems exist because adequate measures for preventing them _________ taken in the past.
admin
2009-02-10
65
问题
Most environmental problems exist because adequate measures for preventing them _________ taken in the past.
选项
A、was not
B、were not
C、were not being
D、being not
答案
B
解析
被动语态的时态、数、性的一致,主要由助动词来表示,要注意它们与主语的一致。此处从句的主语measures是复数,因此选择答案B。
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专业英语四级
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